Free PNG Image Compressor
Compress PNG files while keeping transparent layers crisp and clean.
- 100% free
- Files stay on your device
- No sign-up, no watermark
Choose files or drag & drop
Upload PNG files to convert locally inside your browser.
What is PNG Image Compressor?
PNG files often carry heavy byte weights because of 32-bit RGBA color palettes. Our in-browser PNG compressor uses color quantization and alpha channel dithering to reduce palette sizes while maintaining clean, anti-aliased transparency.
How to use PNG Image Compressor
- 1
Add your file or input
Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.
- 2
Adjust the options
Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.
- 3
Process and download
Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.
Frequently asked questions
How does PNG compression reduce file size while keeping transparency?
The optimizer reduces the color palette from millions of shades to an optimized 256-color palette (PNG-8 with alpha) or optimizes scanline filtering prior to Deflate compression.
Will text and lines in my screenshots remain sharp after PNG compression?
Yes. PNG compression excels at preserving sharp high-contrast edges in typography, screenshots, diagrams, and logos without the ringing artifacts characteristic of JPEG.
Is there a limit on how many PNGs I can optimize in one session?
No. You can compress as many PNG files as your device memory allows with zero daily quotas or paywalls.
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